John mcmukray and robert mcmurray



UNITED STATES PATENT OFFICE.

JOHN MCMURRAY AND ROBERT MCMURRAY, OF NEW YORK, N. Y.

GONSTRUCTING FRAMES FOR WIRE-CLOTH PAPER-MAKING CYLINDERS.

Specification of Letters Patent No. 21,768, dated October 12, 1858.

To all whom 'may concern.'

Be it known that we, J. MCMURRAY and R. MCMURRAY, of the city, county,and State of New York, have invented a new and useful Improvement in theConstruction of lVire-Cloth-Cylinder Frames; and we do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the annexed drawings, making a part of thisspecification, in wliich- Figure l, is a transverse section of ourinvention. Fig. 2, is a longitudinal central section of ditto.

Similar letters of reference indicate corresponding parts in the ntwofigures.

w The obj ect of this invention is to obtain a very rigid frame, onethat will retain its form so as to insure a perfectly cylindrical wirecloth surface.

The invention is designed to be used in paper machines and in othercases where wire cloth cylinders are employed and where it is necessary7to have the wire cloth retained in a perfectly cylindrical form in orderto perform perfectly the desired work.

To enable those skilled in the art to fully understand and construct ourinvention we will proceed to describe it..

A, A, represent what may be termed cylinder heads, constructed of armsa, radiating from a hub I), and having a rim c, at their outer ends. Thehubs Z), have journals c' attached, one to each. The heads niay be ofcast metal, the several parts being cast in one piece.

B, represents a wire or rod which is bent or curved in spiral form andextends the whole length of the cylinder frame, the wire being so bentor curved to form convolutions d, of equal diameter To the outer surfaceof the wire or rod B, there are secured at equal distances apartlongitudinal and parallel rods e, the ends of which are secured inniet-al bands f, which encompass the rims c, of the heads A, A, thebands f, being riveted or otherwise secured to the rims c. The bands f,may each have a ledge or flanch g, at their outer edge, through whichledges or flanches the ends of the rods e, pass, and the exposedportions of the rods may be encompassed by bands It, as shown clearly inFig. 2. The longitudinal rods e, are secured to the wire or rod B, by asmall wire i, and if the rods B, e, are of iron they may, when securedtogether, be galvanized with zinc so as to prevent oxidation and also toform a solder. The rods e, have a wire j, wound spirally around them soas to convert the polygonal forni of the frame, given it by the rods e,into a perfect cylindrical form, the wire j, extending the whole lengthof the cylinder and forming the bed on which the wire cloth C, isplaced.

From the above description it will be seen that no central shaft isemployed, the journals c being attached to and forming parts of the hubsb, of the heads A, A. The usual frames have a shaft on which heads areplaced having longitudinal bars attached to their peripheries. Thedifficulty attending this mode of construction is, that the shaft isliable to bend or be deflected so as to render the whole frame untrue,besides the frame thus constructed is not compact it is liable to becomestrained and the. wire cloth soon departs from a t-rue cylindricalforni. By our improvement this difiiculty is avoided. The central shaftbeing dispensed with, a light frame is obtained and also a perfectlyrigid one, that will retain the wire cloth C, in perfect cylindricalform.

We are aware that a wire j, has been wound spirally around longitudinalbars in order to form a cylindrical surface or bed to a frame to receivethe wire cloth, and we do not claim separately said wire, but havingthus described our invention That we claim as new and desire to secureby Letters Patent, is,

The spiral wire or rod B, and longitudinal rods e, connected tosuitableheads A, provided with journals c', in connection with the spiral-wirej, the whole being arranged substantially as and for the purpose setforth.

JOHN McMURR-AY. ROBERT MCMURRAY.

lVitnesses J. W. CooMBs, M. HUGHES.

